Heat half of the oil in a heavy skillet. Scramble eggs in it. Remove eggs to a large single serving bowl (I like to use pasta bowls for this.) Add rest of oil to the pan. Once hot, add the cabbage and onion (if using), stir fry over medium-high heat until slightly tender, brightly colored and hot. Add garlic and chicken (if cold) during last minute of cooking time. Stir well. Add to eggs in bowl. Top with your favorite sauces. Salt and pepper to taste.